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llvm-project/llvm/unittests/Support/DataExtractorTest.cpp

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//===- llvm/unittest/Support/DataExtractorTest.cpp - DataExtractor tests --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/DataExtractor.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
const char numberData[] = "\x80\x90\xFF\xFF\x80\x00\x00\x00";
const char leb128data[] = "\xA6\x49";
const char bigleb128data[] = "\xAA\xA9\xFF\xAA\xFF\xAA\xFF\x4A";
TEST(DataExtractorTest, OffsetOverflow) {
DataExtractor DE(StringRef(numberData, sizeof(numberData)-1), false, 8);
EXPECT_FALSE(DE.isValidOffsetForDataOfSize(-2U, 5));
}
TEST(DataExtractorTest, UnsignedNumbers) {
DataExtractor DE(StringRef(numberData, sizeof(numberData)-1), false, 8);
uint64_t offset = 0;
EXPECT_EQ(0x80U, DE.getU8(&offset));
EXPECT_EQ(1U, offset);
offset = 0;
EXPECT_EQ(0x8090U, DE.getU16(&offset));
EXPECT_EQ(2U, offset);
offset = 0;
EXPECT_EQ(0x8090FFFFU, DE.getU32(&offset));
EXPECT_EQ(4U, offset);
offset = 0;
EXPECT_EQ(0x8090FFFF80000000ULL, DE.getU64(&offset));
EXPECT_EQ(8U, offset);
offset = 0;
EXPECT_EQ(0x8090FFFF80000000ULL, DE.getAddress(&offset));
EXPECT_EQ(8U, offset);
offset = 0;
uint32_t data[2];
EXPECT_EQ(data, DE.getU32(&offset, data, 2));
EXPECT_EQ(0x8090FFFFU, data[0]);
EXPECT_EQ(0x80000000U, data[1]);
EXPECT_EQ(8U, offset);
offset = 0;
// Now for little endian.
DE = DataExtractor(StringRef(numberData, sizeof(numberData)-1), true, 4);
EXPECT_EQ(0x9080U, DE.getU16(&offset));
EXPECT_EQ(2U, offset);
offset = 0;
EXPECT_EQ(0xFFFF9080U, DE.getU32(&offset));
EXPECT_EQ(4U, offset);
offset = 0;
EXPECT_EQ(0x80FFFF9080ULL, DE.getU64(&offset));
EXPECT_EQ(8U, offset);
offset = 0;
EXPECT_EQ(0xFFFF9080U, DE.getAddress(&offset));
EXPECT_EQ(4U, offset);
offset = 0;
EXPECT_EQ(data, DE.getU32(&offset, data, 2));
EXPECT_EQ(0xFFFF9080U, data[0]);
EXPECT_EQ(0x80U, data[1]);
EXPECT_EQ(8U, offset);
}
TEST(DataExtractorTest, SignedNumbers) {
DataExtractor DE(StringRef(numberData, sizeof(numberData)-1), false, 8);
uint64_t offset = 0;
EXPECT_EQ(-128, DE.getSigned(&offset, 1));
EXPECT_EQ(1U, offset);
offset = 0;
EXPECT_EQ(-32624, DE.getSigned(&offset, 2));
EXPECT_EQ(2U, offset);
offset = 0;
EXPECT_EQ(-2137980929, DE.getSigned(&offset, 4));
EXPECT_EQ(4U, offset);
offset = 0;
EXPECT_EQ(-9182558167379214336LL, DE.getSigned(&offset, 8));
EXPECT_EQ(8U, offset);
}
TEST(DataExtractorTest, Strings) {
const char stringData[] = "hellohello\0hello";
DataExtractor DE(StringRef(stringData, sizeof(stringData)-1), false, 8);
uint64_t offset = 0;
EXPECT_EQ(stringData, DE.getCStr(&offset));
EXPECT_EQ(11U, offset);
EXPECT_EQ(nullptr, DE.getCStr(&offset));
EXPECT_EQ(11U, offset);
DataExtractor::Cursor C(0);
EXPECT_EQ(stringData, DE.getCStr(C));
EXPECT_EQ(11U, C.tell());
EXPECT_EQ(nullptr, DE.getCStr(C));
EXPECT_EQ(11U, C.tell());
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage("no null terminated string at offset 0xb"));
}
TEST(DataExtractorTest, LEB128) {
DataExtractor DE(StringRef(leb128data, sizeof(leb128data)-1), false, 8);
uint64_t offset = 0;
EXPECT_EQ(9382ULL, DE.getULEB128(&offset));
EXPECT_EQ(2U, offset);
offset = 0;
EXPECT_EQ(-7002LL, DE.getSLEB128(&offset));
EXPECT_EQ(2U, offset);
DataExtractor BDE(StringRef(bigleb128data, sizeof(bigleb128data)-1), false,8);
offset = 0;
EXPECT_EQ(42218325750568106ULL, BDE.getULEB128(&offset));
EXPECT_EQ(8U, offset);
offset = 0;
EXPECT_EQ(-29839268287359830LL, BDE.getSLEB128(&offset));
EXPECT_EQ(8U, offset);
}
TEST(DataExtractorTest, LEB128_error) {
DataExtractor DE(StringRef("\x81"), false, 8);
uint64_t Offset = 0;
EXPECT_EQ(0U, DE.getULEB128(&Offset));
EXPECT_EQ(0U, Offset);
Offset = 0;
EXPECT_EQ(0U, DE.getSLEB128(&Offset));
EXPECT_EQ(0U, Offset);
DataExtractor::Cursor C(0);
EXPECT_EQ(0U, DE.getULEB128(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage("unable to decode LEB128 at offset 0x00000000: "
"malformed uleb128, extends past end"));
C = DataExtractor::Cursor(0);
EXPECT_EQ(0U, DE.getSLEB128(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage("unable to decode LEB128 at offset 0x00000000: "
"malformed sleb128, extends past end"));
// Show non-zero offsets are reported appropriately.
C = DataExtractor::Cursor(1);
EXPECT_EQ(0U, DE.getULEB128(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
"malformed uleb128, extends past end"));
}
TEST(DataExtractorTest, Cursor_tell) {
DataExtractor DE(StringRef("AB"), false, 8);
DataExtractor::Cursor C(0);
// A successful read operation advances the cursor
EXPECT_EQ('A', DE.getU8(C));
EXPECT_EQ(1u, C.tell());
// An unsuccessful one doesn't.
EXPECT_EQ(0u, DE.getU16(C));
EXPECT_EQ(1u, C.tell());
// And neither do any subsequent operations.
EXPECT_EQ(0, DE.getU8(C));
EXPECT_EQ(1u, C.tell());
consumeError(C.takeError());
}
TEST(DataExtractorTest, Cursor_seek) {
DataExtractor::Cursor C(5);
C.seek(3);
EXPECT_EQ(3u, C.tell());
C.seek(8);
EXPECT_EQ(8u, C.tell());
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
}
TEST(DataExtractorTest, Cursor_takeError) {
DataExtractor DE(StringRef("AB"), false, 8);
DataExtractor::Cursor C(0);
// Initially, the cursor is in the "success" state.
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
// It remains "success" after a successful read.
EXPECT_EQ('A', DE.getU8(C));
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
// An unsuccessful read sets the error state.
EXPECT_EQ(0u, DE.getU32(C));
EXPECT_THAT_ERROR(C.takeError(), Failed());
// Once set the error sticks until explicitly cleared.
EXPECT_EQ(0u, DE.getU32(C));
EXPECT_EQ(0, DE.getU8(C));
EXPECT_THAT_ERROR(C.takeError(), Failed());
// At which point reads can be succeed again.
EXPECT_EQ('B', DE.getU8(C));
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
}
TEST(DataExtractorTest, Cursor_chaining) {
DataExtractor DE(StringRef("ABCD"), false, 8);
DataExtractor::Cursor C(0);
// Multiple reads can be chained without trigerring any assertions.
EXPECT_EQ('A', DE.getU8(C));
EXPECT_EQ('B', DE.getU8(C));
EXPECT_EQ('C', DE.getU8(C));
EXPECT_EQ('D', DE.getU8(C));
// And the error checked at the end.
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
}
#if defined(GTEST_HAS_DEATH_TEST) && defined(_DEBUG) && \
LLVM_ENABLE_ABI_BREAKING_CHECKS
TEST(DataExtractorDeathTest, Cursor) {
DataExtractor DE(StringRef("AB"), false, 8);
// Even an unused cursor must be checked for errors:
EXPECT_DEATH(DataExtractor::Cursor(0),
"Success values must still be checked prior to being destroyed");
{
auto C = std::make_unique<DataExtractor::Cursor>(0);
EXPECT_EQ(0u, DE.getU32(*C));
// It must also be checked after an unsuccessful operation.
// destruction.
EXPECT_DEATH(C.reset(), "unexpected end of data");
EXPECT_THAT_ERROR(C->takeError(), Failed());
}
{
auto C = std::make_unique<DataExtractor::Cursor>(0);
EXPECT_EQ('A', DE.getU8(*C));
// Same goes for a successful one.
EXPECT_DEATH(
C.reset(),
"Success values must still be checked prior to being destroyed");
EXPECT_THAT_ERROR(C->takeError(), Succeeded());
}
{
auto C = std::make_unique<DataExtractor::Cursor>(0);
EXPECT_EQ('A', DE.getU8(*C));
EXPECT_EQ(0u, DE.getU32(*C));
// Even if a successful operation is followed by an unsuccessful one.
EXPECT_DEATH(C.reset(), "unexpected end of data");
EXPECT_THAT_ERROR(C->takeError(), Failed());
}
{
auto C = std::make_unique<DataExtractor::Cursor>(0);
EXPECT_EQ(0u, DE.getU32(*C));
EXPECT_EQ(0, DE.getU8(*C));
// Even if an unsuccessful operation is followed by one that would normally
// succeed.
EXPECT_DEATH(C.reset(), "unexpected end of data");
EXPECT_THAT_ERROR(C->takeError(), Failed());
}
}
#endif
TEST(DataExtractorTest, getU8_vector) {
DataExtractor DE(StringRef("AB"), false, 8);
DataExtractor::Cursor C(0);
SmallVector<uint8_t, 2> S;
DE.getU8(C, S, 4);
EXPECT_THAT_ERROR(C.takeError(), Failed());
EXPECT_EQ("", toStringRef(S));
DE.getU8(C, S, 2);
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
EXPECT_EQ("AB", toStringRef(S));
C = DataExtractor::Cursor(0x47);
DE.getU8(C, S, 2);
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage("offset 0x47 is beyond the end of data at 0x2"));
}
TEST(DataExtractorTest, getU24) {
DataExtractor DE(StringRef("ABCD"), false, 8);
DataExtractor::Cursor C(0);
EXPECT_EQ(0x414243u, DE.getU24(C));
EXPECT_EQ(0u, DE.getU24(C));
EXPECT_EQ(3u, C.tell());
EXPECT_THAT_ERROR(C.takeError(), Failed());
}
TEST(DataExtractorTest, skip) {
DataExtractor DE(StringRef("AB"), false, 8);
DataExtractor::Cursor C(0);
DE.skip(C, 4);
EXPECT_THAT_ERROR(C.takeError(), Failed());
EXPECT_EQ(0u, C.tell());
DE.skip(C, 2);
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
EXPECT_EQ(2u, C.tell());
}
TEST(DataExtractorTest, eof) {
DataExtractor DE(StringRef("A"), false, 8);
DataExtractor::Cursor C(0);
EXPECT_FALSE(DE.eof(C));
EXPECT_EQ(0, DE.getU16(C));
EXPECT_FALSE(DE.eof(C));
EXPECT_THAT_ERROR(C.takeError(), Failed());
EXPECT_EQ('A', DE.getU8(C));
EXPECT_TRUE(DE.eof(C));
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
}
TEST(DataExtractorTest, size) {
uint8_t Data[] = {'A', 'B', 'C', 'D'};
DataExtractor DE1(StringRef(reinterpret_cast<char *>(Data), sizeof(Data)),
false, 8);
EXPECT_EQ(DE1.size(), sizeof(Data));
DataExtractor DE2(ArrayRef<uint8_t>(Data), false, 8);
EXPECT_EQ(DE2.size(), sizeof(Data));
}
TEST(DataExtractorTest, FixedLengthString) {
const char Data[] = "hello\x00\x00\x00world \thola\x00";
DataExtractor DE(StringRef(Data, sizeof(Data)-1), false, 8);
uint64_t Offset = 0;
StringRef Str;
// Test extracting too many bytes doesn't modify Offset and returns None.
Str = DE.getFixedLengthString(&Offset, sizeof(Data));
EXPECT_TRUE(Str.empty());
EXPECT_EQ(Offset, 0u);
// Test extracting a fixed width C string with trailing NULL characters.
Str = DE.getFixedLengthString(&Offset, 8);
EXPECT_EQ(Offset, 8u);
EXPECT_EQ(Str.size(), 5u);
EXPECT_EQ(Str, "hello");
// Test extracting a fixed width C string with trailing space and tab
// characters.
Str = DE.getFixedLengthString(&Offset, 8, " \t");
EXPECT_EQ(Offset, 16u);
EXPECT_EQ(Str.size(), 5u);
EXPECT_EQ(Str, "world");
// Now extract a normal C string.
Str = DE.getCStrRef(&Offset);
EXPECT_EQ(Str.size(), 4u);
EXPECT_EQ(Str, "hola");
}
TEST(DataExtractorTest, GetBytes) {
// Use data with an embedded NULL character for good measure.
const char Data[] = "\x01\x02\x00\x04";
StringRef Bytes(Data, sizeof(Data)-1);
DataExtractor DE(Bytes, false, 8);
uint64_t Offset = 0;
StringRef Str;
// Test extracting too many bytes doesn't modify Offset and returns None.
Str = DE.getBytes(&Offset, sizeof(Data));
EXPECT_TRUE(Str.empty());
EXPECT_EQ(Offset, 0u);
// Test extracting 4 bytes from the stream.
Str = DE.getBytes(&Offset, 4);
EXPECT_EQ(Offset, 4u);
EXPECT_EQ(Str.size(), 4u);
EXPECT_EQ(Str, Bytes);
DataExtractor::Cursor C(0);
EXPECT_EQ(StringRef("\x01\x02"), DE.getBytes(C, 2));
EXPECT_EQ(StringRef("\x00\x04", 2), DE.getBytes(C, 2));
EXPECT_EQ(StringRef(), DE.getBytes(C, 2));
EXPECT_EQ(StringRef(), DE.getBytes(C, 2));
EXPECT_EQ(4u, C.tell());
EXPECT_THAT_ERROR(C.takeError(), Failed());
}
}
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